<template>
  <div>
    <h1>当前求和为：{{sum}}</h1>
    <h3>当前求和放大10倍为：{{bigSum}}</h3>
    <h3>我在{{school}}学习{{subject}}</h3>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>

<script>
  import {mapState,mapGetters} from 'vuex'
export default {
    name:'Count',
    data(){
      return {
        n:1, //用户选择的数字
      }
    },
    // 靠程序员自己亲自去写计算属性
    computed:{
      /* h(){
        return this.$store.state.sum
      },
      school(){
        return this.$store.state.school
      },
      subject(){
        return this.$store.state.subject
      }, */
      // 借助mapState生成计算属性，从state中读取数据（对象写法）
      // ...mapState({h:'sum',school:'school',subject:'subject'}),
      // 数组写法
      ...mapState(['sum','school','subject']),


      /* bigSum(){
        return this.$store.getters.bigSum
      }, */
      // 借助mapGetters生成计算属性，从getters中读取数据（对象写法）
      // ...mapGetters({bigSum:'bigSum'}),
      // 借助mapGetters生成计算属性，从getters中读取数据（数组写法）
      ...mapGetters(['bigSum']),
    },
    methods: {
      increment(){
        this.$store.commit('JIA',this.n)
      },
      decrement(){
        this.$store.commit('JIAN',this.n)
      },
      incrementOdd(){
        this.$store.dispatch('jiaOdd',this.n)
      },
      incrementWait(){
        this.$store.dispatch('jiaWait',this.n)
      },
    },
    mounted(){
      
    }
}
</script>

<style scoped>
  button{
    margin-left: 6px;
  }
</style>